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Home Brew A 4 To 1 Balun - Many modern HF transceivers come fully equipped
with built in tuners. While these tuners are great for changing bands, the
manufacturers left out a very important accessory; the 4 to 1 balun. With out a balun
the transceiver can only feed an antenna which uses coaxial cable. While this may be
satisfactory.... [Radio Amateur Society of Norwich]
Isolated MOSFET driver has wide duty-cycle range - 29-Apr-04 Issue of EDN
The main application for the circuit in Figure 1 is for driving power MOSFETs with
signals ranging in frequency from 1 Hz to 300 kHz and with duty cycles from 0 to 100%.
You achieve this goal by using a coreless pc-board transformer. The switching
frequency in most power-electronics circuits ranges from a few hertz to a few hundred
kilohertz.... [Design Idea by Jesus Doval-Gandoy and Moises Pereira Martinez, ETSI
Industriales, Vigo, Spain]
